to know when the declaration of independence was signed in the united states? it's a particular date. some people have it engraved in their heads and some people say, "oh, i don't need to be knowing such thing." when was the declaration of independence signed? anyone know what year? have a show of hands. i wanna see you is. show of hands. well, we got almost half the scholastic class here. it turns out to be 1776. some of us are good for remembering figures and some of us aren't. let's try something different. the temperature at the bottom of lake superior, new year's eve, 1900, does anyone in here happen to know what the temperature at the bottom of that lake was at that time? one, two, three, four, five, six, even less people than knew when the declaration of independence was signed. and what has happened-- the temperature happened to be, gang? say again? - four degree celsius. - four degree celsius. you're right, four degrees centigrade, right. celsius, centigrade, same, same gang. that's right, right on. does anyone happen to know what the temperature at the bottom of lake tahoe? that'